Displaying Document Library in an outline (hierarchical fashion)

I want to develop a web page which will have two web parts. In first web part onleft side all the files in a page/document library will be shown in a "Explorer view", i.e.,Folder1File1 under folder1Folder2File1 under folder2File2 under folder2

When I click on link File1 under folder 1, in the second web part in the right,it will show the web page.Basically, Microsoft documentation uses this kind of structure all the timein their on line libraries. How can I implement this on my own web page. I amlooking for a solution wich is avaiable in ITS Sahrepoint 2007 environment (Ihave a portal based on publishing site) without purchaing 3rd party web parts,

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